When, in the 5th century A.D., owing to theological differences the Syriac-using Christians became divided into Nestorians or East Syrians and Jacobites (Monophysites) or West Syrians, certain differences of pronunciation, chiefly in the vowels, began to develop themselves.
The old Semitic a with them remained a, but with the Jacobites passed into o.
The Maronites, and the uniate Jacobites, Chaldaeans and Copts have adopted the Roman mitre.
Modern missions have made no great conquests there, and in earlier times the Nestorians and Jacobites who penetrated to central Asia, China and India, received respectful hearing, but never had anything like the success which attended Buddhism and Islam.
But, in a false alarm, the Jacobites suddenly retreated, and a few years later the town was reimbursed by the State for the Pretender's extortions.